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DGNSS of Korea, South Korea's industrial positioning Leading to the Ministry of Maritime Affairs and Fisheries Satellite Navigation Central Office

Applications of GNSS, Facilities Management

Underground Pipe Defects Across Canada

Enbridge Pipelines Inc. (Enbridge) is a major supplier of liquid hydrocarbons from western Canada to eastern Canada and the Midwestern United States. The underground pipeline system is comprised of approximately 7,400 km of pipe, which transports about 280,000 ㎥ of natural liquid gas and refined products each day. In order to maintain such extensive pipelines, there is a need for an efficient method of locating the position of pipe defects that require repair.

Enbridge decided to use DGPS-based system for this purpose. They used the DGPS receivers to pinpoint the timer box and ground control location and using this method, created reference data for the In-Line Inspection (ILI) tool. Before using GPS, they used to locate defects manually by measuring the distance from a feature in the pipeline such as a valve and the ILI tool. This method produced inaccurate results, and was subjective and expensive.

However, with GPS, Enbridge can map the exact locations of the underground pipeline and any defects. This means when the ILI tool reports a defect, a worker can easily go to that specific location and mark it for the excavation workers.